Device for cleaning the baffle walls of baffle crushing machines

ABSTRACT

A CRUSHER WITH A ROTOR CARRYING CRUSHING TOOLS AND WITH A BAFFLE WALL AGAINST WHICH THE MATERIAL TO BE CRUSHED IS THROWN, IN WHICH THE BAFFLE WALL IS AT LEAST IN PART MOVABLE TOWARD SAID ROTOR TO ALLOW THE CRUSHER TOOLS OF SAID ROTOR TO CLEAN THE BAFFLE WALLS OF DEPOSITS WHICH HAVE COLLECTED ON SAID BAFFLE WALL. AUTOMATIC CONTROLS ACT, IN RESPONSE TO A TIMER, TO PERIODICALLY THROTTLE THE MATERIAL FEED TO THE CRUSHER WHILE THE BAFFLE IS AUTOMATICALLY MOVED TOWARD THE ROTOR FOR THE CLEANING ACTION.

United States Patent References Cited UNITED STATES PATENTS 2/1906Simpson....................... 1,315,152 4/1917 [72] lnventor llelmutErnst Adoll Heinrich Rheinhausen, Germany [21 1 Appl. No. 732,284

[22] Filed May 27, 1968 81 1,671 [45] Patented June 28, 1971 [73]Assignee Fried Krupp Gesellschalt rnit beschrankter l 12/ g g l naming.Essen, Germany I." an [32] Priority May 27, 1967 Primary Examiner-Donald G. Kelly Attorney-Walter Becker Germany [54] DEVICE FOR CLEANINGTHE BAFFLE WALLS OF ABSTRACT: A crusher with a rotor carrying crushingtools BAFFLE CRUSHING MACHINES 5 Claims, 2 Drawing Figs.

and with a baffle wall against which the material to be crushed isthrown, in which the baffle wall is at least in part movable toward saidrotor to allow the crusher tools of said rotor to clean the baffle wallsof deposits which have collected on said baffle wall. Automatic controlsact, in response to a timer, to periodically throttle the material feedto the crusher while the baffle is automatically moved toward the rotorfor the cleaning action.

PATENTED. JUN28 1971 Inventor: HELMUT ERNST ADOLF HENRI!" DEVICE FORCLEANING THE BAFFLE WALLS OF RAFFLE CRUSHING MACHINES The presentinvention relates to baffle crushing machines and method of cleaning thebaffle walls of such machines. More specifically, the present inventionconcerns the cleaning of baffle walls from deposits in baffle crushingmachines having a rotor rotating about a horizontal axis and equippedwith crushing tools.

With baffle crushing machines of the above-mentioned type, particularlyat the drawing-in range of the baffle walls, there exists the dangerthat deposits will collect and thereby will harmfully affect thedrawing-in of the material to be crushed and consequently the output ofthe machine. In particular this danger is present with moist sticky orsticking material so that such baffle crushing machines may undercertain circumstances even be completely clogged up. The tendency of thematerial to collect particularly at the drawing-in area of the bafflewalls is increased in baffle crushing machines, such as hammer mills,beater mill, crushers, etc., due to the fact that the material to becrushed by the crushing tools is thrown against the baffle walls at highspeed.

Heretofore it has been customary to remove the deposits on the bafflewalls of such baffle crushing machines by stopping the machine andmanually by means of a poker bar to scrape the deposited material offthe baffle walls. Furthermore it has been attempted to clean the bafflewalls from deposited material in baffle crushing machines by heating thebaffle walls. In this way the deposited material is dried so that itssticking ability to the walls is reduced and a breaking off of thematerial from the walls is at least aided. This last-mentioned method isdisadvantageous not only in view of the necessity of heating the wallsbut also due to the doubtful success.

Finally, baffle crushing machines have become known in which thecleaning of the baffle walls from deposited material is brought about bydesigning the impact walls as part of a continuously rotating plate bandso that the material deposited on said band will break off at the areaswhere the band is reversed while a portion ofthe deposited material isscraped off outside the working chamber. Aside from the fact that suchan arrangement requires a rather expensive construction, it is alsodisadvantageous due to the fact that the plate band cannot be guided ina way suitable for the crushing operation and, moreover, is subjected torapid wear.

It is, therefore, an object of the present invention to overcome theabove-mentioned drawbacks.

It is another object of this invention to provide a method of and designa device for cleaning the baffle walls of baffle crushing machines whichis of low cost and requires a minimum of time for each individualcleaning operation.

It is another object of this invention to provide a device and method asset forth in the preceding paragraph, which will permit giving thebaffle walls a shape which is most favorable for the crushing operation.

These and other objects and advantages of the invention will appear moreclearly from the following specification in connection with theaccompanying drawing, in which:

FIG. 1 represents a vertical section through a crushing machineaccording to the present invention which is designed for cleaning thebaffle walls by hand.

FIG. 2 is a portion of a corresponding vertical section through amachine according to the invention which is intended for cleaning thebaffle walls by means of a power operable device. I

The invention is seen primarily in that temporarily for a brief periodof time the supply of material to be crushed is throttled or interruptedwhile the baffle walls or at least those portions thereof which arelocated within the drawing-in range ofthe machine and where the materialmay collect, are moved toward the circulatory path-of the crushing toolsbut up to a safe distance therefrom only, and then are returned to thenormal baffle wall position whereupon the supply of material is againcontinued. The cleaning operation occurs during the approaching movementof the baffle walls toward the circulatory path of the rotating crushingtools while overloading the machine can be avoided by suitably selectingthe speed of approach of the baffle walls toward the circulatory path ofthe crushing tools. Each such cleaning operation can be effected eitherby hand or by means of adjusting spindles operated by a handwheel orpurely mechanically. Moreover, the cleaning may be effectedautomatically by means of a control mechanism which controls the supplyof the material and actuates the adjustment of the baffle walls. Thisoperation can be initiated in predetermined time intervals by means oftimer mechanisms.

Especially when very moist material is involved, for instance limecontaining soft coal, the cleaning may be aided by heating the bafflewalls.

1 The method according to the present invention may be realized in aparticularly simple manner by effecting the feeding movement and returnmovement of a baffle wall by pivoting the same about an axis which isparallel to the axis of rotation of the rotor of the baffle crushingmachine. However, also other possibilities of feeding and withdrawingthe baffle walls are possible and within the ambit of the presentinvention.

A particularly advantageous baffle crushing machine for carrying out themethod according to the invention consists in that the pivot axis of thebaffle wall is arranged on that side of the baffle wall which faces awayfrom the rotor and is located within the area of the lower portion ofthe baffle wall. The point of attack of the adjusting may coincide withsaid pivot axis, said adjusting device serving for adjusting the widthof the gap at the lower end of the baffle wall for limiting the granularsize of the material being discharged.

The location of the axis of rotation of the baffle wall and theshape-thereof are always so to be selected that within the area in whichthe material will collect, in particular on the baffle wall, the bafflewall can be moved or fed toward the circulator path of the rotatingcrushing tools so as to remain a safe distance therefrom, whereas theremaining areas of the baffle wall must not enter said circulatory path.The danger of a collision of the baffle wall with the circulating orrotating crushing tools exists primarily in the intermediate area of thebaffle wall when the latter, in vertical section, has the shape of acircular segmental arc with a radius which differs only slightly fromthe radius of said circulatory path. When the axis of rota tion of thebaffle wall is located on that side which faces away from the rotor andis arranged within the area of the lower portion of the baffle wall,according to the invention, the baffle wall may, in order to avoid theabove-mentioned danger, have a parabolic shape in vertical section, theradius of curvature of which within the area of the zenith located abovesaid axis of rotation is slightly less than the radius of thecirculatory path.

Referring now to the drawing in detail, the machine disclosed thereincomprises a housing I in which a rotor 2 is rotatably journaled forrotation about a horizontal axis 20.

Pivotally supported by rotor 2 are hammers 3 which determine thecirculatory path 4. The baffle wall 5 is covered with wear-resistantplates 7 and is pivotable about a pivot shaft 8. An adjusting device 17for adjusting the width of the bight or gap between the circulatory path4 and the lower end of the baffle wall 5 is connected to the pivot shaft8. The full line position of the baffle wall 5 indicates the baffleposition, whereas the baffle wall position 6 shown in dot-dash linesindicates the end position during the cleaning of the baffle wall. Theadjusting device for the baffle wall 5 for purpose ofcleaning, isoperatively connected to a bolt 9. The supply ofmatericleaning of wall 5by the hammers 3. Furthermore, a timer T is provided which at set timeintervals may actuate a hydraulic system 20, 21 and 22 to close flaps 23to thereby temporarily close off the inlet 13 so that during this periodafter adjust ment of wall 5, the latter may be cleaned.

The device according to FIG. 2 is very similar to that of FIG. 1 withthe exception that the piston rod 16 ofa cylinder piston unit isconnected to the bolt 9. The cylinder piston unit 25 is in turncontrolled by a timer T1 which controls a valve 24.

It is, of course, to be understood that the invention as set forth abovehas been described in connection with a possible embodiment of theinvention only and that the showing in the drawing is ofa mereexplanatory character and is not limiting the invention the scope ofwhich is determined by the claims appended hereto.

lclaim:

1'. In combination with a crusher having housing means with inlet meansand also having a rotor located within said housing means and equippedwith crushing tools pivotally connected thereto for crushing thematerial admitted into said housing means through said inlet means:baffle wall means arranged within said housing means so as to face aportion of the periphery of said rotor while a portion of said bafflewall means is located near said inlet means, first control means forselectively controlling said inlet means, second control meansoperatively connected to said baffle wall means for reducing thedistance between at least a portion of said baffle wall means and saidrotor to cause said tools to clean said baffle wall means of depositsthereon, automatic means operatively connected to said first and secondcontrol means and operable at a desired time to cause said first controlmeans temporarily to throttle said inlet means and to cause said secondcontrol means temporarily to reduce the distance between at least aportion of said baffle wall means and said rotor, and timer meansadapted to be set for initiating operation of said automatic controlmeans at set time intervals.

2. An arrangement in combination according to claim 1, which includesheating means for heating said baffle wall means.

3. An arrangement in combination according to claim 1,

which includes: shaft means substantially parallel to the axis ofrotation of said rotor and pivotally supporting said baffle wall means,said second control means being operable to tilt said baffle wall meansabout the axis of said shaft means.

-4. An arrangement in combination according to claim 3, in which saidshaft means is located on that side of said baffle wall-means whichfaces away from said rotor and near the lower portion of said bafflewall means.

5. An arrangement in combination according to claim 3, in which thatsurface of said baffle wall means which faces toward said rotor followsapproximately a cross section having the contour of a parabola theradius of curvature of which within the area of the zenith portion abovesaid shaft means approximately is less than the radius of the circularpath described by the outer end of said crushing tools.

